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Finding the Fourth Proportional to 630.38, 869.86 and 381.61

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Solution

The fourth proportional to 630.38, 869.86 and 381.61 is: 526.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.38 : 869.86 = 381.61 : x
  2. Step 2: Convert to fraction form
    630.38/869.86 = 381.61/x
  3. Step 3: Cross multiply
    630.38x = 869.86 × 381.61
  4. Step 4: Simplify right side
    630.38x = 331,941.02
  5. Step 5: Solve for x
    x = 331,941.02/630.38
  6. Step 6: Final answer
    x = 526.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.